Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe6c9c79c49f942…

MALICIOUS

PDF

89.0 KB Created: 2021-07-21 05:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f460b163ab23cf99d2d2cda2f6c3e333 SHA-1: 94d1dcc554a518c825b36f8cc51bc1a92f234c9b SHA-256: 2fe6c9c79c49f942846833a578b5388d97b427b53df37c245fb7e30362c122e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload directories and disposable hosting sites. The embedded URLs are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn----otbbfbbknchz.xn--p1ai/sadm_files/dotopidosinujemoxu.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14c869a4de5f0826d08016a43f38bcef/visovupifawiwowel.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xidawofidorufolana.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/q3jal3g33ifsqieh7ksqals7t3/parodov.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/d652deab1e395053eb42175050a6b4bb/58569302501.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/siguwotidogokore.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/nuloxadotimo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/166db711068a52733368f4ab3abd2591/17750591615.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a999567fd85---24005297025.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747cb888eba---kinofemojokilijagaruxul.pdfIn PDF document text
    • http://topas.lt/userfiles/file/kofugut.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9jb15qrm1lkaffnei2a6oe9k67/filopokasejujezemumijepo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/cbdf20719097cd3b8815e5c453fe93de/5870093393.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/fekuzexikok.pdfIn PDF document text
    • http://abroadster.com/files/zekizaliwilidowerosane.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/jogejozaka.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d521ea2db7---dizemokemebujage.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/krin1o4vb96dioglaa5kadq1e6/43020783626.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2673b59dc63d3bc559aff400b34f5baf/29044117703.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/xusonivezolawe.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a56878d2ac4---7635285249.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4fj1faurbg366dsq659440o3ak/68019737203.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/28284751687.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f89bdb0692b3dff760c0c5772ba123f3/gukolate.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5ab45614fad364ce21de9053856f30be/manolidoxetojezogivirose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=find+the+thermodynamic+cycle+not+related+to+cogenerationPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 17388 bytes
SHA-256: 482f2ef4d37a1527f4c9fe56d2a6559674b59867fd4d332f8ea38b856858310a
font_02_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 10740 bytes
SHA-256: 4b32d0e57247cf8eb2caba43f3992c534c5b52e3b04263687f9d6b51a24575b2